JPS6030962Y2 - Device to prevent plate width narrowing due to winder tension - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing the narrowing phenomenon of the strip width that occurs at the beginning of the winding machine when rolling a thin material using a hot strip mill.

When rolling thin materials (3.2 mm or less) using hot strip mills, the top of the strip leaving the final finishing stand is hot run while being wound into the winder.
In the process of passing through the table, some looping of the strip occurs on the table, as the top is simply being pushed past by the trailing part.

However, when the top reaches the position of the winder and winding begins, tension is suddenly applied to the strip, which had been in a relaxed state until then, causing momentary abnormal tension and localized tension. This causes a phenomenon (necking) that narrows the board width.

When necking occurs in a material, the width of the plate deviates from the standard, resulting in a defective product and a decrease in the yield of finished products. Therefore, methods for preventing the occurrence of abnormal tension have been studied.

Since this abnormal tension is caused by the inertia of the winder, conventionally the motor of the winder mandrel has been improved to have a connection structure that can be disconnected, so that it can be temporarily disconnected immediately after winding. However, a satisfactory prevention effect has not been obtained, and therefore there has been a desire to develop a new prevention means.

The purpose of the present invention is to meet the conventional demands and improve the yield of finished products by providing a device that can reliably prevent abnormal tension occurring at the beginning of winding.

The main focus of the present invention is to first control the loop to prevent the strip from being extremely relaxed, but rather to apply a certain amount of tension immediately before winding, which causes abnormal tension, and then to provide a buffering effect. This is because the structure is such that the tension is gradually transferred to the tension during winding.

The device of the present invention is installed on a hot run table between the final stand F and the winder C of a finishing mill.

The device of the present invention is mainly composed of a support block 2 that holds the strip S from below, an elevating table 1 that holds the support block, and a control device 3 that commands the elevating table to operate.

The elevating table 1 can be moved up and down within a certain range by an elevating drive mechanism 11 such as a cylinder, and a holding frame 12 for the support block 2 is formed on the upper surface. A load cell 13 is provided to detect a lowering load.

The support block 2 is fitted into the holding frame 12 of the lifting table 1 with a spring 22 interposed, and is normally held at a substantially constant height within the holding frame. When it is applied, it sinks into the holding frame 12 against the elastic action of the spring 22.

A plurality of pieces (two types in this example) are placed on the upper part of the support block 2.
A roller 21 is rotatably mounted so as to come into contact with the lower surface of the strip S.

On the other hand, the control device 3 receives a signal for detecting an increase in load when the winding machine C catches the material, and a signal for detecting the material tension in the load cell 13. The detection signal is compared with each set value, and when the jamming signal exceeds the set value, the lifting drive mechanism 11 is commanded to ascend, and when the material tension detection signal exceeds the set value, it is commanded to descend. It's Nishide.

Next, the operation of this device will be explained.

Initially, the lifting table 1 is held at the position of the strip S threading line, and the top of the strip S sent out from the final stand F is placed on the hot run line including the rollers 21.
It runs on the table in a non-tensioned state and is eventually sent to the winder C via the pinch roller P.

Until the moment when the top is caught in winder C,
The strip S is passed over the hot run table with a slight loop.

Now, when the top of the strip is caught in the winder C, the load on the motor M of the winder C increases, and this detection signal is sent to the control signal 3.

As a result, the control device 3 immediately commands the lifting drive device 11 to raise the lifting table 1 and the support block 2 supported thereon.

By raising the support block 2 to the position indicated by the two-dot chain line, the strip S with the loop is kept under some tension.

As the winding operation of the winder C progresses, the tension of the strip S gradually increases, and during this time the spring 22 exerts a buffering function to absorb this tension and prevent the support block 2 from being pushed into the holding frame 12. Allow.

The tension in the strip is indirectly detected by the load cell 13, which sends a material tension detection signal to the control device 3.

When the level of the material tension detection signal exceeds the set value, the control device 3 immediately instructs the lifting drive mechanism 11 to lower, and the lifting table 1 and the support block 2 are gradually lowered to the lower limit position shown in the figure.

As a result, in the process of the strip S going from a relaxed state with loops to a tensioned state with winding tension,
The winding operation is performed through a very natural tension increasing process without going through the process of generating abnormal tension.

As described above, according to the device of the present invention, a certain amount of tension is applied to the strip during the relaxation process, and when a sudden strong tension occurs, this is absorbed by the buffer device to prevent abnormal tension from occurring. This structure prevents the plate width from narrowing due to abnormal tension.
Product yield can be greatly improved.

In addition, according to the embodiment of the present invention, the product retention is 0.1 to 0.2%.
I saw an improvement in

[Brief explanation of the drawing]

The drawing is a schematic diagram showing the overall configuration of a device for preventing plate width narrowing due to winder tension according to the present invention. 1: Elevating table, 2: Support block, 3: Control device,
C: Winder, S varnish) IJ knob.

Claims (1)

[Scope of utility model registration request] In the strip width narrowing prevention device installed between the final stand of the hot finishing mill and the winder, 1. It has an elevating table that has a built-in load cell for detecting the push-down load and is operated by an elevating drive mechanism, and a roller that comes into contact with the back side of the strip during threading, and is fitted onto the upper part of the elevating table by using an elastic member. In response to a detection signal when the top of the strip is caught in the winder, the lifting drive mechanism is commanded to rise, and in response to a material tension detection signal from the load cell, the lifting drive mechanism is A device for preventing narrowing of the board width due to the tension of the winder.